getting interrupt number

[Saumendra Dash]

-----Original Message-----
From: kernelnewbies-bounces at kernelnewbies.org [mailto:kernelnewbies-bounces at kernelnewbies.org] On Behalf Of Valdis.Kletnieks at vt.edu
Sent: Monday, March 09, 2015 8:14 AM
To: Ronit Halder
Cc: kernelnewbies at kernelnewbies.org
Subject: Re: getting interrupt number

On Mon, 09 Mar 2015 07:55:10 +0530, Ronit Halder said:
>> How to get the interrupt number of a device.I know it's device id and 
>> the bus number.
>> The device is a usb mouse.

>In that case, you won't find an interrupt number for the mouse, you'll find one for the USB controller the mouse is attached to.  Make note that the same USB controller will catch interrupts for *all* devices on that USB bus.

Since USB devices uses PCI window, you can find the interrupt number of the USB controller, by reading  the IRQ Line (PCI_INTERRUPT_LINE) form the PCI config. Space, using pci_read_config_byte(). 

- Saumendra


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